Abstract: Semiconductive members such as charging members, copying members, pressure fixation rolls, electricity removing members and the like having a small environmental dependence are provided. The semiconductive member of the present invention contains a semiconductive substrate, a conductive rubber layer, an intermediate layer, a resistance control layer the constituent material of which is a polyurethane ionomer having an ionic segment in the molecule, and a surface layer. The ionic segment is selected from among a sulfonic acid group, a carboxyl group and a tertiary amino radical, or the salts thereof. In addition, the glass transition temperature of this polyurethane ionomer is 30.degree. C. or less, and the volume specific resistance value is in the range of 10.sup.6 to 10.sup.9 W cm.

Abstract: A varnish for the formation of a coating layer on a tooth surface to protect healthy tooth surface against the erosion by an acid etching solution during tooth restoration which comprises a polymer comprising vinyl chloride and vinyl acetate as the main monomer units dissolved in a dentally acceptable solvent.

Abstract: An electrophotographic photoreceptor for producing an electrostatic latent image on the top layer thereof which comprises from the bottom up:A. a substrateB. a layer of metallic palladium having a thickness of from 5A to 1000A,c. a layer including vitreous selenium having a thickness of from 0.05 to 3 microns andD. a top layer including polyvinyl carbazole having a recurring unit of the formula: ##STR1## wherein X is a member selected from a group consisting of hydrogen, halogen, nitro, alkyl, aryl, alkyl aryl, amino and alkylamino.